Question

此查询：

SELECT COUNT(source) AS count
FROM call_details
GROUP BY source
HAVING count >1

返回大约1500（我正在查找的数字）结果，只有count字段。我怎么能还返回所有计数字段的总和？当我尝试

SELECT COUNT(source) AS count,
SUM(count) as total
FROM call_details
GROUP BY source
HAVING count >1

我在'字段列表'错误中收到'未知列'计数'。

和

SELECT COUNT(source) AS count,
SUM(COUNT(source)) as total
FROM call_details
GROUP BY source
HAVING count >1

给我一个'无效使用群组功能'

有什么想法吗？我可以做第一组mysql_num_rows($result)（获取我需要的信息），但我真的想通过MySQL来做。

Answer 1

SELECT COUNT(count) FROM (SELECT COUNT(source) AS count
FROM call_details
GROUP BY source
HAVING count > 1) as A

Answer 2

您无法在行上下文中获得全局总计。在COUNT（）在任何特定行上完成时，没有什么要SUM，因为还没有计算其他行。

您必须首先运行SUM查询以获取您的个人统计信息，然后在脚本中手动汇总，或者使用周围的SUM子句重新运行查询：

SELECT SUM(count) FROM (
   SELECT original query here...
)

Answer 3

假设您要在应用程序中获取所有结果，我认为最有效的方法是在应用程序代码中总结它。

Answer 4

试试这个

select mycount, sum(mycount) as sumcount
from
(SELECT COUNT(source) AS mycount FROM call_details GROUP BY source HAVING mycount >1)   counttable

Answer 5

只需删除选择查询中的“分组依据”子句

即可

# first, get your counts by source
SELECT COUNT(source) AS count
FROM call_details
GROUP BY source
HAVING count >1

# then, get the overall total
SELECT COUNT(source) AS count
FROM call_details
HAVING count >1

MySQL查询 - 使用COUNT的SUM

5 个答案: